I shove a 8-10" length of siphon tubing on the end of my cobra/picnic tap and cap on foam. Filling from the bottom is the best plan to reduce foaming and oxy-absorbing caps. I've never had a single note back on a scoresheet indicating oxidation when I submitted a keg conditioned beer to contest in bottles.

One other option, depending on how much you have in your fermenter, is to fill up a six pack from the fermenter and then drop a Cooper's carb tab into each bottle, then put it away to condition just like any other bottle conditioned beer, then keg up the rest. I've found, with my last several batches, I've had enough to get a full 5 gallons into the keg and still get another 4-6 bottles to boot. It's nice to have the carb tabs on hand, rather than dumping that four pack or sixer down the drain.

I shove a 8-10" length of siphon tubing on the end of my cobra/picnic tap and cap on foam. Filling from the bottom is the best plan to reduce foaming and oxy-absorbing caps. I've never had a single note back on a scoresheet indicating oxidation when I submitted a keg conditioned beer to contest in bottles.

Do you also have the stopper for the top of the bottle to keep the pressure up or do you just fill it from the bottom at really low pressure?